Read the following passage and circle the letter A, B, C or D to indicate the correct word that best fits each of the numbered blanks from 34-38

The USA is encouraging Americans to wear face masks. There has been a lot of talk about whether or not face masks are effective in helping slow down the (34) ____________ of the COVID -19 coronavirus. The government is set to encourage Americans to use homemade face covering like cloth masks, bandanas and scarves. At first, the WHO and (35) ____________ health organizations recommended that people (36) ____________ were not sick didn’t need to wear masks or cover their faces. (37) ____________, it is now proved that face masks can work (38) ____________. They point to countries like Singapore and South Korea, where people wear masks and reported infection rates are lower.